It's about using the right punctuation when abbreviation is used at the end of sentence. It has been asked here when the sentence is a question: How to deal with abbreviations at the end of a question?.

What about sentences like the following:

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Two dots or one dot?

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Common practice is to use only one period at the end of a sentence when an abbreviation would use a period. For other punctuation, such as a comma or semicolon, both the abbreviation's period and the other punctuation mark would typically be used. The issue might often be avoided by expanding the abbreviation.

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